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Finding the Fourth Proportional to 792.80, 1,187.58 and 499.40

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Solution

The fourth proportional to 792.80, 1,187.58 and 499.40 is: 748.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.80 : 1,187.58 = 499.40 : x
  2. Step 2: Convert to fraction form
    792.80/1,187.58 = 499.40/x
  3. Step 3: Cross multiply
    792.80x = 1,187.58 × 499.40
  4. Step 4: Simplify right side
    792.80x = 593,077.45
  5. Step 5: Solve for x
    x = 593,077.45/792.80
  6. Step 6: Final answer
    x = 748.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.